Multi-configuration herb grinder with enhanced crushing efficiency and interchangeable contoured grinding surfaces

An apparatus comprising:

• an upper grinding housing having an upper contoured grinding surface, wherein the upper contoured grinding surface does not contain any teeth, wherein the upper contoured grinding surface extends between an outer edge and a center of the upper contoured grinding surface and consists solely of smooth concave upper valleys that form upper ridges where adjacent upper valleys meet, wherein each of the upper ridges extends non-linearly from the outer edge toward the center as viewed in a top-down view, and wherein the upper contoured grinding surface does not include any flat or planar surfaces between the outer edge and the center;
• and
• a lower grinding housing having a lower contoured grinding surface, wherein the lower contoured grinding surface does not contain any teeth, wherein the lower contoured grinding surface extends between an outer edge and a center of the lower contoured grinding surface and consists solely of smooth concave lower valleys that form lower ridges where adjacent lower valleys meet, wherein each of the lower ridges extends non-linearly from the outer edge toward the center as viewed in a top-down view, wherein the lower contoured grinding surface does not include any flat or planar surfaces between the outer edge and the center, wherein the lower contoured grinding surface has a plurality of openings disposed within the lower valleys, wherein the upper contoured grinding surface and the lower contoured grinding surface mate thereby forming a non-planar grinding surface, wherein the upper contoured grinding surface and the lower contoured grinding surface are rotationally symmetrical, and wherein the upper ridges and lower ridges are equal in number.

An apparatus comprising:

• an upper grinding housing having an upper contoured grinding surface, wherein the upper contoured grinding surface does not contain any teeth, wherein the upper contoured grinding surface extends between an outer edge and a center of the upper contoured grinding surface and consists solely of smooth concave upper valleys that form upper ridges where adjacent upper valleys meet, wherein each of the upper ridges extends non-linearly from the outer edge toward the center as viewed in a top-down view, and wherein the upper contoured grinding surface does not include any flat or planar surfaces between the outer edge and the center;
• a lower grinding housing having a lower contoured grinding surface, wherein the lower contoured grinding surface does not contain any teeth, wherein the lower contoured grinding surface extends between an outer edge and a center of the lower contoured grinding surface and consists solely of smooth concave lower valleys that form lower ridges where adjacent lower valleys meet, wherein each of the lower ridges extends non-linearly from the outer edge toward the center as viewed in a top-down view, wherein the lower contoured grinding surface does not include any flat or planar surfaces between the outer edge and the center, wherein the lower contoured grinding surface has a plurality of openings disposed within the lower valleys, wherein the upper contoured grinding surface and the lower contoured grinding surface mate thereby forming a non-planar grinding surface;
• an upper collection chamber attachable to the lower grinding housing, wherein the upper collection chamber includes a mesh screen;
• and
• a lower collection chamber attachable to the upper collection chamber, wherein the mesh screen provides passage of particles smaller than a predetermined size from the upper collection chamber to the lower collection chamber.